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debian/rules: fix regression installing init script for systems that have not been converted to dependency-based start
Load rules from /etc/iptables/rules.v4 instead of /etc/iptables/rules for consistency, and rename the rules file appropriately to keep local modifications
During installation, prompt the user to save the current rulesets
iptables-persistent.init: show useful progress messages using LSB functions, and implement a "save" action for the lazy^w efficient admin